Appeal No. 94-3287
Application 07/835,152
mixing n-butane and air in a reactor feed
flow channel having a surface to volume ratio
of not greater than about 4 m to produce a-1
mixture containing at least about 1.7%, said
feed flow channel containing an autoignition
suppression agent in contact with said
mixture, said autoignition suppression agent
comprising an ignition inhibiting component
selected from the group consisting of acid
sites and trivalent phosphorus.
27. In a process for the manufacture of maleic anhydride by
catalytic oxidation of n-butane over a vanadium/phosphorus oxide
catalyst comprising mixing n-butane with air and passing the
resulting mixture over said catalyst in a catalytic reaction
zone, the improvement which comprises:
mixing n-butane and air in a reactor feed
flow channel to produce a mixture containing
at least about 1.8% by volume n-butane and
hydrocarbons having a boiling point higher
than n-butane in a proportion of at least
about 2% by volume based on n-butane content,
said feed flow channel containing an
autoignition suppression agent in contact
with said mixture, said autoignition
suppression agent comprising an ignition
inhibiting component selected from the group
consisting of acid sites and trivalent
phosphorus.
The reference relied upon by the examiner as evidence of
obviousness is:
Umemura et al. (Umemura) 54-46713 Apr. 12, 1979
(Japanese Kokai)
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